//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20

// <flat_set>

// flat_multiset(const flat_multiset& m);

#include <algorithm>
#include <cassert>
#include <deque>
#include <flat_set>
#include <vector>

#include "test_macros.h"
#include "../../../test_compare.h"
#include "test_allocator.h"

template <template <class...> class KeyContainer>
constexpr void test() {
  {
    using C = test_less<int>;
    KeyContainer<int, test_allocator<int>> ks({1, 3, 5, 3, 1}, test_allocator<int>(6));
    const int expected[] = {1, 1, 3, 3, 5};
    using M              = std::flat_multiset<int, C, decltype(ks)>;
    auto mo              = M(ks, C(5));
    auto m               = mo;

    assert(m.key_comp() == C(5));
    assert(std::ranges::equal(m, expected));
    auto keys = std::move(m).extract();
    assert(keys.get_allocator() == test_allocator<int>(6));

    // mo is unchanged
    assert(mo.key_comp() == C(5));
    assert(std::ranges::equal(mo, expected));
    auto keys2 = std::move(mo).extract();
    assert(keys2.get_allocator() == test_allocator<int>(6));
  }
  {
    using C              = test_less<int>;
    using Ks             = KeyContainer<int, other_allocator<int>>;
    auto ks              = Ks({1, 3, 5, 3, 1}, other_allocator<int>(6));
    const int expected[] = {1, 1, 3, 3, 5};
    using M              = std::flat_multiset<int, C, Ks>;
    auto mo              = M(Ks(ks, other_allocator<int>(6)), C(5));
    auto m               = mo;

    assert(m.key_comp() == C(5));
    assert(std::ranges::equal(m, expected));
    auto keys = std::move(m).extract();
    assert(keys.get_allocator() == other_allocator<int>(-2));

    // mo is unchanged
    assert(mo.key_comp() == C(5));
    assert(std::ranges::equal(mo, expected));
    auto keys2 = std::move(mo).extract();
    assert(keys2.get_allocator() == other_allocator<int>(6));
  }
}

constexpr bool test() {
  test<std::vector>();

#ifndef __cpp_lib_constexpr_deque
  if (!TEST_IS_CONSTANT_EVALUATED)
#endif
    test<std::deque>();

  return true;
}

int main(int, char**) {
  test();
#if TEST_STD_VER >= 26
  static_assert(test());
#endif

  return 0;
}
